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Constructing an Angle of 90 degrees

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Xuất bản 09/08/2016
How to construct an angle of 90° (using just a straightedge and compass, without a protractor)? Find the answer in this video. Construction on paper. Video without words. Thanks to Rex Boggs, Rockhampton Grammar School, Australia ( ) for help with the English translation. Music by longzijun, . My math materials in English: . My (whole) website: .
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